Electromagnetic device



ELECTROMAGNETIC-DEVICE Filed March l5, 1930 Fly. lm 1 Patented Jan. 19, 1932 UNITED, STATES, PATENT OFFICE GEORGE I). MILNEVQE oAxrARx, ILLINOIS, AssIGNoR To WESTERN ELECTRIC con- PANY, INCORPORATED, or NEW yoRR, N. Y., a coRpoRA'rIoN or NEW YORK ELECTROMVAGNETIC DEVICE Application llledhiarch` 15, 1930. Serial No. 436,182.

This invention yrelates to an electromagnetic device, and more particularly to an electromagnetic device in which its armature 1s retained in its attracted positions.l

'A5 An object of this invention is to provide a simple, inexpensive, and eflicient electromagnetic device in which ts armature isretained in its attracted positions. l i f In accordance with this object, one embodiment of the invention pertains to an'electromagnetic device which comprises a pair of oppositely disposed electromagnets having armatures mechanically interconnected and provided with an oft' center spring effective positions.

A clear understanding of the invention will be had from the following description of one specific embodiment thereof when taken in connection with the accompanying drawings, wherein Fig. l is a side view of a pair of oppositely mounted 'telephone relays, the armatures of which are shown connected to a mechanical retaining apparatus; r

Fig. 2 is a'sectional view lof the connected relays, taken on the line 2 2 of Fig. 1 to show said retaining apparatus in plan, and

Fig. 3 is an end view of the apparatus.v

Referring nowto the drawings wherein like reference numerals designate similar parts throughout the several figures, there is disclosed a pair of telephone relays having coils 5 and 6, respectively, and inwardly releasing or opening U-shaped armatures 7 and 'for retaining the armatures in their attracted .these Springs to control the circuits which `may, be connected tothe terminal connectors Vat they left hand ends-thereof. Bolt studs 24 and25 are secured to the pole pieces 20.a nd 21 to limit the inward or releasing movement-` of the armatures. l j l The contemplated apparatus formechanically retaining the relays in their attracted positions vincludes a". U-shaped support 26 which is secured to studs 18 which are mounted on the `mounting plate 11 by screws27 a cross piece 28fbeing secured to the sides of tV e support for bracing purposes.- A crank shaft 29 is journaled inthe outer Vend of the support 26 and has two `eccentric or crank portions to which are connectedlinks'and 31 which are-coupled to yokes32 and 33, respec-V tively, which extend over the sides ofther ole npieces`20fand 2l for guiding purposes, w lch yokes are secured to theends of the armatures 7 and 8. A crank arm or lever, 34 extends in' tegrally vfrom one .end ofthe ,crank ,shaft 29 for controlling these circuits current is mo- 8, the relays being secured by screws 9 and 10 to a mounting plate 11. These relays are provided with contact springs12and 13, respectively, which have contact points at their free ends and which have terminal connectors 17 and 19 extending to the left through apertures 14 in the mounting plate. The coils 5 and 6 terminate in connectors 15 andf16 (Fig. l) The ri ht hand ends ofthe armatures 7 and 8 are o set as especially shown in.Fig. v3 to conform to the shape of and cooperate with pole pieces or core extensions 20 and 21, and plungers 22 and 23 extend from the armatures 7 and 8, respectively, through apertures in the contact springs 12 andl 13 to -actuate mentarily applied from a suitable power sup-^ ply circuit to the terminals 15 of thecoil 5, which current momentarily attracts the armature 7 and moves the crank arm 34 to its upper position as shown in the drawings. yThe coil spring 36 then retains the armature 7 in this attracted position throughconnection with the link 30 and the yoke 32, itrbeing noted that Vno further energizing current is required in Vthe coilv5, since the spring 36 maintains. the armature in this position. `,When the armature 7 `is to be released currentis'appliedrto YKthe terminals 16of the coil 6foffthe lower relay through ya suitable power/circuit 1which may be connected therewithto attract the `armature Spandthus actuate thecrank shaft i 29 and move the crank arm 34 to its lower position, the spring 36 then retaining the crank arm 34 in this position. Thus, it is apparent that the crank shaft, spring, and link structure provided by this invention mechanically retains the relay armature in its attractedposition to eliminate the necessity of continuous energizing current bein-g applied thereto. The contact springs 13 of the lower relay 6 may also be connected .to circuits to be controlled similarly to the contact springs 12, the operation with respect thereto being the same as that above de scribed.

,From the foregoing description the construction and operation of the apparatus is believed to be apparent, but it will of course be understood that the invention is to be limited 4only by the scope of the appended claims.

lVhat is claimed is:

1. In an electromagnetic device, a coil, an armatureattracted thereby, means mounted adjacent the armature and pivoted about its ow'n axis, means connecting the pivotal means to the armature, and a resilient `member secured to the pivotal means for retaining the armature in attracted position.

'2. In an electromagnetic device, a coil, lan armature attracted thereby, an eccentric member mounted adjacent the armature, means connecting the eccentric member to the armature, and a coiled resilient member secured to the eccentric member for retaining the armature in attracted position.

3. In an electromagnetic device, a coil, an armature attracted thereby, a crank shaft mounted adjacent the armature, means link ing 'the crank shaft with the armature, anda resilient member connected to the crankshaft for retaining the armature in attracted position.

4. In an electromagnetic device, a coil, an 'armature attracted thereby, a support mounted adjacent the armature, a crank shaft `journal'ed in the support, means linking the crank shaft with the armature, and a resilient memlber 'connected to the crankshaft for yield- "ingly retaining the armature in attracted position.

5. In an electromagnetic device, a pair of Ladjacentlv positioned coils, armatures -supported adjoining the coils and movable independently by the action of said coils to r -t-Wo positions, pivotal means mounted between the armatures and linked therewith, 4and a `resilient member directly connected with the pivotal means for retaining the armatures in either position to Which they are attracted by the coils.

I6. In a relay, a pair of adjacently mounted coils, an armature supported adjoining each coil, a supported mounted -between the coils, a crank shaft having an extending crankarm and journaled in the support, means linking each armature With the crank shaft, and a coiled spring connected to the extending arm of the crank shaft for retaining armatures in either position to Which they are moved by the coils.

7. In an electric relay, an armature movable to either of two positions, electromag netic means for moving the armature from one to the .other of said positions, a member rotatably mounted adjacent the armature and connected thereto, and yielding means cooperating With the rotatable member' to maintain the armature in either of said posit-ions to which it may be moved.

8. In an electromagnetic device, a coil, an armature actuated Vupon the -energization of said coil, a pivotally mounted eccentric member positioned adjacent the armature, and a resilient means operative through `the eccentric member for retaining the 4armature in its attracted position.

In Witness whereof, I hereunto :subscribe my name this 27th day of February, A. D.

GEORGE D. MILNE. 

